class Settings():
	#存储一些配置项
	def __init__(self):
		#屏幕设置
		self.screen_width = 1200
		self.screen_height = 800
		self.bg_color = (230,230,230)
		#飞船的速度设置
		self.ship_speed_factor = 1.5
		#子弹的设置
		self.bullet_speed_factor = 1
		self.bullet_width = 3
		self.bullet_height = 15
		self.bullet_color = (60,60,60)
		#外星人移动速度
		self.fleet_drop_speed = 10
		self.alien_speed_factor = 1
		#向左向右移动，1为向右，-1为向左
		self.fleet_direction = 1
